Seasonal variation of high-molecular-weight compounds in the water-soluble fraction of organic urban aerosols

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Author(s) Samburova, Vera, Szidat, Sönke, Hueglin, Christoph, Fisseha, Rebeka, Baltensperger, Urs, Zenobi, Renato, Kalberer, Markus
Publication Type Journal Items, Publication Status: Published
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Title Seasonal variation of high-molecular-weight compounds in the water-soluble fraction of organic urban aerosols
Author(s) Samburova, Vera
Szidat, Sönke
Hueglin, Christoph
Fisseha, Rebeka
Baltensperger, Urs
Zenobi, Renato
Kalberer, Markus
Description 9 p.
Journal or Series Title Journal of geophysical research. D, Atmospheres
Volume Number 110
Issue Number 23
Start Page D23210
ISSN 0148-0227
Publisher American Geophysical Union
Publication Place Washington, DC
Publication Date 2005
Keyword(s) HULIS
Urban aerosol
Abstract [1] Aerosol samples were collected in Zurich, Switzerland, at an urban background site and were analyzed with size exclusion chromatography ( SEC) and laser/desorption ionization mass spectrometry (LDI-MS) for water-soluble organic compounds with high molecular weight. Daily samples were collected during two campaigns in winter and summer, for 1 month each. The concentration of high-molecular-weight compounds ( humic-like substances (HULIS)) was between 0.4 and 4 mu g/m(3) in winter and summer. The most intense signals in the LDI-MS mass spectra were measured between m/z150 and 500, comparing well with the mode of the two main high mass peaks determined with SEC corresponding to masses between 200 and 600 Da. For the maximum molecular weight, however, different results were obtained by the two techniques: whereas a maximum molecular weight between 1300 and 3300 Da was found with SEC, hardly any peaks above m/z700 were measured with LDI-MS. During summer the maximum molecular weight of HULIS ( determined with SEC) correlates positively with several parameters such as ozone and increased temperature indicative of enhanced atmospheric photo-oxidation. The HULIS concentration also correlates positively with the oxalic acid concentration in the particles. This suggests that HULIS are generated by secondary processes in summer. The lack of such correlations during winter suggests that other sources and processes might be important during colder seasons.
DOI 10.1029/2005JD005910
Additional Notes Received 23 February 2005, Accepted 26 September 2005, Published 10 December 2005
Document Type Article
Publication Status Published
Language English
Assigned Organisational Unit(s) 03430
Organisational Unit(s)
NEBIS System Number 004289357
Source Database ID WOS-000234248200001
PP-21469
SCOPUS-31344472860
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@article{Smbrv2005,
  author = "Samburova, Vera and Szidat, S{\"{o}}nke and Hueglin, Christoph and Fisseha, Rebeka and Baltensperger, Urs and Zenobi, Renato and Kalberer, Markus",
  title = "{S}easonal variation of high-molecular-weight compounds in the water-soluble fraction of organic urban aerosols",
  journal = "Journal of geophysical research. D, Atmospheres",
  year = 2005,
  volume = "110",
  number = "23",
  pages = "D23210--",
}


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